A place to keep my thoughts on programming

April 17, 2007 java , ,

Reading a resource in eclipse or jar

Disclaimer: I’ve been trying to store some text resources in my jar so that i can easily package uncompiled content with my executable. This course of action seemed like the natural thing to do. However what I had to do to actually access this file and allow for different environments like running from eclipse vs. executing the jar makes me wonder if I’m missing some essential facilities. I.e. can eclipse build the jar and execute it instead of running it’s class files, so that you can test jar stored executions as part of eclipses normal debug and excution? And is there some facility that let’s you just say InputStream res = App.GetResourceStream()?. Well, in the meantime here’s what i cobbled together to get this working, since my googling didn’t come up with a single source that put it all together.

First thing, we need to determine where we are executing, both because its the base for finding our resource and because it tells us whether we’re dealing with a directory hierarchy or a jar file:

ProtectionDomain protectionDomain = this.getClass().getProtectionDomain();
CodeSource codeSource = protectionDomain.getCodeSource();
URL location = codeSource.getLocation();
File f = new File(location.getFile());

Now we get an InputStream, depending on what environment we’re in:

String resourcePath = "resources/xsl/register.xsl";
InputStream resourceStream = null;
if (f.isFile()) {
    // it's a file, so we assume it's a jar and look for our
    // resource as a JarEntry
    JarFile jar = new JarFile(f);
    JarEntry xslEntry = jar.getJarEntry(resourcePath);
    resourceStream = jar.getInputStream(xslEntry);
} else {
    // it's a directory, so we just append our relative resource
    // path
    resourceStream = new FileInputStream(f.getAbsolutePath() + "/"
            + resourcePath);

Now we have an InputStream and can ingest the file anyway we like.

1 to “Reading a resource in eclipse or jar”

  1. Craig says...

    Thanks for a nice solution.
    In my case, I'm using an applet in an HTML page and I run into permission problems with the getProtectionDomain call even though the applet is deployed in a signed jar file.  Is there a way around this? 

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